tty: constify tty_port_operations structs

---
 drivers/tty/goldfish.c | 2 +-
 drivers/tty/mxser.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
 
diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index 0f82c0b..752232c 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -162,7 +162,7 @@ static int goldfish_tty_console_setup(struct console *co, char *options)
 	return 0;
 }
 
-static struct tty_port_operations goldfish_port_ops = {
+static const struct tty_port_operations goldfish_port_ops = {
 	.activate = goldfish_tty_activate,
 	.shutdown = goldfish_tty_shutdown
 };
diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 9a0791e..2f12bb9 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2336,7 +2336,7 @@ static const struct tty_operations mxser_ops = {
 	.get_icount = mxser_get_icount,
 };
 
-static struct tty_port_operations mxser_port_ops = {
+static const struct tty_port_operations mxser_port_ops = {
 	.carrier_raised = mxser_carrier_raised,
 	.dtr_rts = mxser_dtr_rts,
 	.activate = mxser_activate,